Aerobic exercise reduced the amount of CHRONO bound to BMAL1 and ameliorated glucose metabolic dysfunction in skeletal muscle of high-fat diet-fed mice

Apr 15, 2023Life sciences

Aerobic exercise lowers CHRONO binding to BMAL1 and improves muscle glucose metabolism in mice on a high-fat diet

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Circadian Biology on OpenScience ↗PubMed ↗DOI ↗

Abstract

Aerobic exercise decreased the amount of CHRONO bound to BMAL1 in high-fat diet-fed mice.

High-fat diet feeding for 12 weeks led to weight gain, serum dyslipidemia, and insulin resistance in mice.
Increased binding of CHRONO to BMAL1 was observed in the skeletal muscle of high-fat diet-fed mice.
Aerobic exercise prevented weight gain and improved serum lipid profiles in mice on a high-fat diet.
Exercise enhanced glucose uptake, glucose oxidation, and glycogenesis in the skeletal muscle of high-fat diet-fed mice.
Aerobic exercise may counteract the negative effects of high-fat diets on glucose metabolism and insulin sensitivity.

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AIMS: The purpose of this study was to investigate the effects of aerobic exercise on the CHRONO-BMAL1 pathway and glucose metabolism in skeletal muscle of high-fat diet (HFD)-fed mice.

MAIN METHODS: Male C57BL/6J mice were randomly allocated into four groups: normal chow diet with control (NCD + CON), NCD with exercise (NCD + EXE), HFD with control (HFD + CON) and HFD with exercise (HFD + EXE). The NCD and HFD groups were respectively fed a diet of 10 % and 60 % kilocalories from fat for 12 weeks. During the dietary intervention, EXE groups were subjected to 70 % VOintensity of treadmill exercise six times per week for 12 weeks. Body weight, energy intake, fat weight, serum lipid profiles, systemic glucose homeostasis, the amount of CHRONO bound to BMAL1, the enzymatic activity, mRNA and protein expression involved in glucose metabolism of skeletal muscle were measured. 2max

KEY FINDINGS: The results showed that the 12-week HFD feeding without exercise induced weight gain, serum dyslipidemia and insulin resistance. Furthermore, HFD increased the amount of CHRONO bound to BMAL1 and repressed the glucose metabolism in skeletal muscle. However, aerobic exercise prevented weight gain, serum dyslipidemia and systemic insulin resistance in the HFD-fed mice. Meanwhile, aerobic exercise also decreased the amount of CHRONO bound to BMAL1 and increased the glucose uptake, glucose oxidation and glycogenesis in skeletal muscle of the HFD-fed mice.

SIGNIFICANCE: These data suggested that aerobic exercise could counterbalance CHRONO interacted with BMAL1 and prevent glucose metabolism dysfunction of skeletal muscle, and finally maintain whole-body insulin sensitivity in the HFD-fed mice.

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Aerobic exercise reduced the amount of CHRONO bound to BMAL1 and ameliorated glucose metabolic dysfunction in skeletal muscle of high-fat diet-fed mice

Abstract

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